How to Use Diatomaceous Earth for Organic Pest Control

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Photo Courtesy Safer Brand
When buying DE to use around your house, be sure to buy a product listed as “food grade.”

This article is part of ourOrganic Pest Control Series, which includes articles on attracting beneficial insects, controlling specific garden pests, and using organic pesticides.

What Is Diatomaceous Earth?

Diatomaceous earth (DE) is a powder made from fossilized prehistoric crustaceans called diatoms. The sharp edges of DE cut into insects’ bodies, causing them to die of dehydration. Diatomaceous earth is most useful in dry situations — for example, puffing it into crevices where cockroaches have been seen. In the first few days after their habitat is treated, cockroaches may become more visible as they desperately search for water, but will die within two weeks. DE becomes less effective when wet, yet still can be used in the garden to make life difficult for newly emerged Japanese beetles or cutworms. In dry weather, DE spread beneath plants will kill slugs.

  • Published on May 7, 2013
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